The Hansa-Brandenburg W.29 German fighter monoplane floatplane was a new type of seaplane evolved by Heinkel during the last months of 1917 and served during the closing months of World War I.

The Hansa-Brandenburg W.29 had a 195 hp Benz engine with exhaust stubs discharging above and to left of the exposed cylinder heads; its front-mounted radiator and louvers in the metal side panels which enclosed the bulk of the engine providing cooling; and its thick, broad wings, made of wood and fabric and rigged with several degrees of dihedral, made it a strong, stable fighting platform.

The struts between the floats and lower wings provided more-than-adequate strength. The depth of its fuselage made up for the lack of a vertical stabilizer, and the inverted position of the rudder gave the observer a wide field to fire his ring mount Parabellum machine gun. Armament consisted of a synchronized Spandau gun on each side of the pilot's cockpit, and the observer shared his cockpit-space with a Parabellum gun on a ring mounting.

Flown mainly on the North Sea, its most famous pilot was Oberleutnant Christiensen (Friedrich Christiansen).With a top speed of 110 mph and excellent maneuverability, the Hansa-Brandenburg W.29 was a worthy adversary against the opposing Short sea planes and Curtiss and Felixstowe flying boats. Moreover, on July 6th, 1918, a formation of Hansa-Brandenburg W.29s led by Christiansen made a surprise attack the British submarine C25 they discovered on the surface; the submarine's motors were quickly put out of action and many of the crew, including its Commanding Officer, became casualties.